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What kind of vent is this?

If you mean the vent on top of the chimney, it could be venting any number of things such as your furnace or hot water tank. Interesting that it appears to have FOUR outlets. I'm sure a roofer will be along to give you the proper name. I'm sure you could find an ample replacement at your local heating and AC distributor or even at your local Big Box hardware store. Just take a pic with you to show them what you need.

What kind of vent is this?

Looks like a fake chimney that someone ran a HWH or furnace flue through. I would remove the chimney, install a tall cone flashing and rain collar, and shingle it in. The flanges should be enveloped with Ice Dams Protection Membrane. I'm not sure if this is on the front or back slope of your home. I would re-route it to the rear slope. Definitely get rid of that hideous looking fake chimney, or whatever it is.

__________________" A lot of men build things, and a lot of things fall down "